Assignment Operators that are used to assign the operator on the left the value on the right. The basic assigment operator is the "=" operator.

These operators are used modify the current value stored in a variable. Some of the compound assignment operators are +=, -=, *=, /=, %=, >>=, <<=, &=, ^=, |=.

  #include <iostream.h>
  int main( )
   {
    int x = 13;
    int y = 6;
    int z = 3;
    x %= y; 
    z += y;
    cout << "The current value of x::" << x << '\n' ;
    cout << "The current value of y::" << z << '\n' ;
    return 0;
   }

   The current value of x::1
   The current value of y::9

In the above example the first the modulus is calculated with "x%=y", which is equivalent to "x=x%y". Same way instead of using "z=z+y" the compound assigment operator "+=" is used.